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Total de focos = 2500.
Entonces hallamos los 2/5 del total de focos.
2500 * 2/5
(2500 * 2)/5
5000/5
1000
.......................................................
Y en otra partes.
Los 2/10 de 2500.
2/10 * 2500
(2 * 2500)/10
5000/10
500
...........................................................................
Sumamos.
1000 + 500 = 1500.
Ha comprado 1500 focos.